Colon cancer controls versus population controls in case-control studies of occupational risk factors

BMC Cancer

Table 3 Odds ratios for occupational characteristics in colon cancer controls compared with population controls

	Colon cancer controls (N = 254)		Population controls (N = 320)		Crude OR¹	Adjusted OR²	95% CI²
Occupation	No.	%	No.	%
Health care³
-Men⁴	4	3	3	2	1.8	1.9	0.4–8.8
-Women⁴	18	18	21	17	1.1	1.1	0.5–2.1
-Both sexes	22	9	24	8	1.2	1.2	0.6–2.3
Farming³
-Men⁴	23	15	48	25	0.6	0.5	0.3–0.9
-Women⁴	7	7	4	3	2.3	2.1	0.6–7.6
-Both sexes	30	12	52	16	0.7	0.7	0.4–1.1
Farming animals³
-Men⁴	20	13	48	25	0.5	0.4	0.2–0.8
-Women⁴	5	5	3	2	2.1	2.0	0.5–8.9
-Both sexes	25	10	51	16	0.6	0.5	0.3–0.9
High temperatures⁵
-Men⁴	17	11	29	15	0.7	0.7	0.4–1.4
-Women⁴	5	5	7	6	0.9	0.9	0.3–3.0
-Both sexes	22	9	36	11	0.8	0.8	0.4–1.3
Chemicals hormonal effects⁶
-Men⁴	6	4	15	8	0.5	0.5	0.2–1.3
-Women⁴	6	6	6	5	1.3	1.3	0.4–4.1
-Both sexes	12	5	21	7	0.7	0.7	0.3–1.5
Pesticides⁷
-Men⁴	12	8	33	17	0.4	0.4	0.2–0.8
-Women⁴	3	3	3	2	1.3	1.3	0.3–6.5
-Both sexes	15	6	36	11	0.5	0.5	0.3–0.9
-Adjusted for farm work	-		-		-	0.6	0.3–1.2

¹ Crude odds ratio (OR). ² OR with 95 % confidence interval (CI), adjusted for year of birth and age. If expected values were less than 5, Fishers exact test was used with stratification by year of birth (2 levels) and sex. ³ Ever working in these occupations. ⁴ OR with 95 % confidence interval (CI) adjusted for year of birth. If expected values were less than 5, Fishers exact test was used with stratification by year of birth (2 levels). ⁵ Ever working in high temperatures. ⁶ Ever working with chemicals with hormonal effects. ⁷ Ever working with pesticides.

ISSN: 1471-2407